Elena’s (Nina Dobrev) transition into a vampire isn’t just going to be rough on her — it’s going to put everyone in Mystic Falls through hell! In this clip from the Oct. 11 season premiere of The Vampire Diaries, Damon (Ian Somerhalder) slams his little bro for giving Elena false hope about reversing the change, leading Stefan (Paul Wesley) to make a dramatic confession.

“I made a choice that I will regret for the rest of my life,” Stefan admits. “Now let me try to fix it.”